21158442496 has 20 divisors (see below), whose sum is σ = 42275560932. Its totient is φ = 10579220992.

The previous prime is 21158442457. The next prime is 21158442523. The reversal of 21158442496 is 69424485112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20662030 + ... + 20663053.

Almost surely, 2^21158442496 is an apocalyptic number.

It is an amenable number.

21158442496 is a deficient number, since it is larger than the sum of its proper divisors (21117118436).

21158442496 is an frugal number, since it uses more digits than its factorization.

21158442496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41325101 (or 41325085 counting only the distinct ones).

The product of its digits is 552960, while the sum is 46.

The spelling of 21158442496 in words is "twenty-one billion, one hundred fifty-eight million, four hundred forty-two thousand, four hundred ninety-six".